//---------------------------------------------------------------------------

// Example: CsmUnlock:

//---------------------------------------------------------------------------

// This function unlocks the CSM. User must replace 0xFFFF's with current

// password for the DSP. Returns 1 if unlock is successful.

#define STATUS_FAIL          0

#define STATUS_SUCCESS       1

Uint16 CsmUnlock()

{

    volatile Uint16 temp;

    // Load the key registers with the current password. The 0xFFFF's are dummy

   // passwords.  User should replace them with the correct password for the DSP.

    EALLOW;

    CsmRegs.KEY0 = 0xFFFF;

    CsmRegs.KEY1 = 0xFFFF;

    CsmRegs.KEY2 = 0xFFFF;

    CsmRegs.KEY3 = 0xFFFF;

    CsmRegs.KEY4 = 0xFFFF;

    CsmRegs.KEY5 = 0xFFFF;

    CsmRegs.KEY6 = 0xFFFF;

    CsmRegs.KEY7 = 0xFFFF;

    EDIS;

    // Perform a dummy read of the password locations

    // if they match the key values, the CSM will unlock

    temp = CsmPwl.PSWD0;

    temp = CsmPwl.PSWD1;

    temp = CsmPwl.PSWD2;

    temp = CsmPwl.PSWD3;

    temp = CsmPwl.PSWD4;

    temp = CsmPwl.PSWD5;

    temp = CsmPwl.PSWD6;

    temp = CsmPwl.PSWD7;

    // If the CSM unlocked, return succes, otherwise return

    // failure.

    if (CsmRegs.CSMSCR.bit.SECURE == 0) return STATUS_SUCCESS;

    else return STATUS_FAIL;

}

转自《C2000手册》